SRAM MTB: Guide Series Brake Service

This video will guide you through the service procedure for SRAM Guide series mountain bike brakes View a complete list of necessary tools and supplies in the video description below and go to SRAM.com/service for more information Clamp the bicycle into a work stand and remove the wheel Remove the eclip from the pad retention bolt and remove the pad retention bolt from the caliper Remove the brake pads from the caliper Notice: DOT fluid will damage painted surfaces If any fluid comes in contact with a painted surface, or printing on the brakes, wipe it off immediately and clean it with isopropyl alcohol or water Damage to painted and or printed surfaces by DOT fluid is not covered under warranty Install the pad retention bolt Insert the pad spreader so that it snaps onto the pad retention bolt Squeeze the brake lever repeatedly to advance the pistons and stop when they contact the pad spreader Remove the banjo bolt and hose Remove the caliper mounting bolts and hardware Hold the hose boot away from the lever body to expose the compression nut Unthread the compression nut, then pull the brake hose and compression fitting from the brake lever body Remove the lever and clamp Notice: If the system has been contaminated with mineral oil or DOT 5 fluid, flush all the parts with soapy water rinse and allow all parts to dry prior to rebuilding. Install new seals, a new bladder and a new hose Ensure the work area, gloves and any shop towels are free of mineral oil or DOT5 contamination For best results, use only SRAM High-Performance DOT 5.1 fluid If SRAM fluid is not available use only DOT 5.1 or 4 fluid Caliper Service Remove the pad spreader Remove the pad retention bolt Remove each caliper body bolt Separate the caliper body halves and set the heat shield aside Remove the caliper body seals from the outboard half and the pistons from both halves Remove the four piston seals Caution: Do not scratch the seal gland with the pick. Scratches could cause fluid to leak when the brake is applied which will contaminate the brake pads and could lead to brake failure Clean the caliper halves Apply a small amount of SRAM high performance DOT 5.1 fluid to new seals and install them into each caliper body half Notice: Do not use grease including DOT compatible grease Grease will prevent the pistons from fully retracting into the caliper bores, which will reduce braking performance Apply a small amount of SRAM DOT fluid to the pistons and install them into the caliper bores Add a small amount of DOT compatible grease to the new caliper body seals Then install them into the caliper Align the caliper body halves, then thread each body bolt into the caliper two full turns Install the heat shield so that the tabs are in the alignment holes on each side of the caliper Ensure that the heat shield remains pressed against the caliper Tighten each body bolt Visually inspect the caliper to confirm the caliper body seals are not protruding If a seal is visible remove the caliper body bolts and reinstall Pinched seals may cause leaks Insert the bleed block into the caliper Install the pad retention bolt Click the appropriate link in the video description below to jump directly to the service instructions for your Guide model brake lever, or continue watching to view the procedure for all models Guide Ultimate / Guide RSC Lever Service Pour the brake fluid into an oil pan

Squeeze the lever blade to pump out the excess brake fluid from inside the lever body Remove the reservoir cap bolt nearest the lever blade Carefully turn the lever body upside down so the detent spring and ball fall out of the lever body If they do not initially fall out, gently tap the lever against a clean lint-free shop towel Remove the remaining reservoir cap bolt Remove the reservoir cap and bladder from the lever body Pour the fluid from the brake lever body into a pan Separate the bladder from the reservoir cap Remove the lever pivot bolts Remove the lever blade Remove the swing link pinch bolt Push the swing link pivot pin out of the lever body Use the T8 Torx wrench to remove the swing link Remove the swing link bushings Use a SRAM Lever Internals Assembly Tool to unthread the piston sleeve and coupler Insert the tool into the lever body and align the key slot of the tool with the piston slave Use the tool to unthread the sleeve and remove the sleeve and coupler Place a towel over the lever body to prevent the piston assembly spring from forcefully ejecting Caution: Use safety glasses. The piston assembly is spring loaded and will forcefully eject from the lever body when the contact knob is removed Push out the contact adjust knob Remove the piston assembly from the lever body If the piston does not come out freely, insert a 2 mm hex wrench through the nose of the lever body to push the piston out Notice: Do not scratch the master cylinder bore of the lever body with the wrench. Scratches can cause diminished brake performance Clean the lever body with isopropyl alcohol or water and a clean lint-free shop towel Submerge the new piston assembly in SRAM high performance DOT 5.1 fluid, being careful not to damage the seals Install the new lubricated piston assembly into the lever body Use the SRAM Lever Internals Assembly tool to press the piston into the lever body inserting the contact adjust knob into the contact adjust slide You should hear a pop sound when the contact knob is fully seated in place Place the new sleeve on the new coupler Use the SRAM lever internals assembly tool to engage and thread the sleeve and coupler onto the piston assembly Engage the slots on the sleeve with the contact adjust, and continue to thread the tool in a clockwise rotation until it stops Install the swing link bushings Place the swing link into the SRAM lever internals assembly tool all use a 2 mm hex wrench to tighten the push rod against the tool Use the hex wrench to remove the swing link from the tool and place the push rod into the coupler slave Align the holes of the swing link and the swing link bushings then press the pivot pin into the hole until it is flush with the lever body Apply a small amount of Loctite blue 242 onto the pinch bolt Thread the swing link pinch bolt into the lever body Tighten the pinch bolt Line up the pivot holes of the lever blade with the pivot holes in the lever body Place the lever bias spring on the lever body Make sure the lever bias spring is seated properly in the lever Apply a small amount of Loctite blue 242 onto each pivot bolt Thread the pivot bolts into the bearings on each side of the lever body Tighten each pivot bolt Press the new bladder into the reservoir cap so the bladder is properly seated and flush with the reservoir cap Insert the reservoir cap and bladder assembly into the lever body Install the detent ball followed by the detent spring into the lever body reservoir hole closest to the lever blade Tighten each reservoir cap bolt Clean the lever body with isopropyl alcohol or water and a clean lint-free shop towel

To jump to the next step, click the brake installation link in the video description below Guide RS Lever Service Pour the brake fluid into an oil pan Squeeze the lever blade to force any remaining brake fluid out of the lever body Remove the reservoir cap bolts from the reservoir cap Remove the reservoir cap and bladder from the lever body Pour the fluid from the brake lever body into a pan Separate the bladder from the reservoir cap Remove the binder plug Remove the pinch bolt Push out the pivot pin Remove the lever blade from the lever body To hold all lever blade parts together, reinstall the lever pivot pin and set the assembly aside Remove the lever bushings from both sides of the lever Remove the swing link pivot pinch bolt Push out the swing link pivot pin Use the T8 Torx wrench to remove the swing link Remove the swing link bushings from both sides of the lever Use long tipped internal snap ring pliers to apply downward pressure to the lever body and remove the snap ring Remove the washer, and remove the piston assembly Caution: Wear safety glasses. The internal piston spring assembly is preloaded and will come out of the lever body quickly, which can result in injury If the piston does not come out freely insert a 2 mm hex wrench through the nose of the lever body to push the piston out Notice: Do not scratch the master cylinder bore of the lever body with the wrench. Scratches can cause diminished brake performance Clean the lever body with isopropyl alcohol or water and a clean lint-free shop towel Submerge a new piston assembly in SRAM High Performance DOT 5.1 fluid Install the new lubricated piston assembly into the lever body Install the washer on the piston assembly Use long tipped internal snap ring pliers to push the piston assembly into the lever body, and secure the snap ring in its groove Orient the snap ring eyelets opposite the lever blade opening Insert the lever blade bushings into both sides of the lever Install the swing link bushings Place the push rod into the piston Line up the hole in the swing link with the hole in the bushings then push the pivot pin into the hole until it stops Apply a small amount of Loctite blue 242 onto the threads of the swing link pivot pinch bolt Thread the swing link pivot pinch bolt into the swing link Tighten the pivot pinch bolt Insert the lever blade assembly into the lever body Place the lever by a spring on the lever body Make sure the lever bias spring is seated properly in the lever Line up the cam and lever blade with the hole in the lever body, then press the pivot pin through the holes Apply a small amount of Loctite blue 242 onto the pinch bolt Thread the pinch bolt into the lever body Tighten the bolt Install the new binder bolt block Press the new bladder into the reservoir cap so the bladder is properly seated and flush with the reservoir cap Insert the reservoir cap and bladder assembly into the lever body Tighten each reservoir cap bolt Clean the lever body with isopropyl alcohol or water and a clean lint-free shop towel To jump to the next step click the brake installation link in the video description below Guide R Lever Service Pour the brake fluid into an oil pan Squeeze the lever blade to force any remaining brake fluid out of the lever body Remove the reservoir cap bolts from the reservoir cap Remove the reservoir cap and bladder from the lever body

Pour the fluid from the brake lever body into a pan Separate the bladder from the reservoir cap Remove the binder plug Remove the pinch bolt Push out the pivot pin Remove the lever blade from the lever body To hold all lever blade parts together, reinstall the lever pivot pin and set the assembly aside Remove the lever bushings from both sides of the lever Use long tipped internal snap ring pliers to apply downward pressure to the lever body, and remove the snap ring Remove the washer and remove the piston assembly Caution: Wear safety glasses. The internal piston spring assembly is preloaded and will come out of the lever body quickly, which can result in injury If the piston does not come out freely, insert a 2mm hex wrench through the nose of the lever body to push the piston out Notice: Do not scratch the master cylinder bore of the lever body with the wrench. Scratches can cause diminished brake performance Clean the lever body with isopropyl alcohol or water and a clean lint-free shop towel Submerge a new piston assembly in SRAM high-performance DOT 5.1 fluid Install the new lubricated piston assembly into the lever body Install the washer on the piston assembly Use long tipped internal snap ring pliers to push the piston assembly into the lever body and secure the snap ring in its groove Orient the snap ring eyelets opposite the lever blade opening Insert the lever blade bushings into both sides of the lever Install the lever blade assembly into the lever body, inserting the push rod into the piston and place the lever bias spring on the lever body Make sure the lever bias spring is seated properly in the lever Line up the cam and lever blade with the holes in the lever body, then press the pivot pin through the holes Apply a small amount of Loctite blue 242 onto the pinch bolt Thread the pinch bolt into the lever body Tighten the pinch bolt Install the new binder bolt plug Press the new bladder into the reservoir cap so the bladder is properly seated and flush with the reservoir cap Insert the reservoir cap and bladder assembly into the lever body Tighten each reservoir cap bolt Clean the lever body with isopropyl alcohol or water and a clean lint-free shop towel Brake Installation Reinstall the brake lever onto the handlebars Cut the hose to install a new barb and compression fitting Make sure the rubber boot and compression nut are installed on the hose Apply DOT grease to the hose barb threads Thread the hose barb into the hose until it is flush with the end of the hose Notice: Do not over tighten the hose barb. Over tightening may cause damage to the hose liner Thread the compression fitting over the hose barb counterclockwise until it is flush or slightly lower than the hose barb The compression fitting is reverse threaded Apply DOT grease to the outside of the compression fitting and the threads of the compression nut Install the compression fitting and nut into the lever Tighten the compression nut Install the hose boot over the compression nut Remove the o-rings from the banjo bolt and banjo fitting Apply a small amount of SRAM high performance DOT 5.1 fluid to the new o-rings and install them Install the caliper and mounting hardware onto the bicycle Install the banjo and hose then tighten the banjo bolt Servicing your brakes removes all of the fluid from the system You must bleed the brakes after you service the brake caliper and/or lever For brake bleed, brake hose shortening and brake pad replacement instructions, visit SRAM.com/service or click this link for video instructions

This concludes the service procedure for SRAM Guide series mountain bike brakes